code: def dequeue(self, acknowledge=True, timeout=0):
      wait_step = 1
      for waited in range(0, timeout + wait_step, wait_step):
          response = self.subclient.api.pull(
              self.sub_name, return_immediately=True, max_messages=1
          )
          msgs = response.received_messages
          if any(msgs):
              break
          elif waited == timeout:
              return None
          else:
              self.logger.info(
                  (
                      "No messages found, sleeping for {} "
                      + " (total sleep time {})"
                  ).format(wait_step, waited)
              )
              time.sleep(wait_step)
  
      retval = msgs[0]
  
      if acknowledge:
          self.acknowledge(retval.ack_id)
          self.logger.debug(
              "Message {} received and acknowledged".format(
                  retval.message.message_id
              )
          )
  
          return sixdecode(retval.message.data)
      else:
          self.logger.debug(
              "Message {} received, ack_id {}".format(
                  retval.message.message_id, retval.ack_id
              )
          )
          return (sixdecode(retval.message.data), retval.ack_id)
  
file_path: studio/studio/pubsub_queue.py
imports: import os
  import json
  import time
  from google.api_core.exceptions import RetryError
  from studio.util.util import sixdecode, retry, parse_verbosity, check_for_kb_interrupt
  from studio.util import logs
label_desc: Use image node_id 6 for calling the PubsubQueue obj's underlying member method code with example usage: obj.dequeue(acknowledge, timeout) and returns: sixdecode, sixdecode,  retval, None